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    <title>Chapter7</title>
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        <h1>Let's Learn Html5</h1>
        <p>发挥您的美感与想象力，探索web开发的无限可能性,现邀请您一同踏上HTML5的学习之旅。</p>
        <a href="index.html" id="enroll">邀您参加</a>
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